No, PaperUI does not render sitemaps. Only BasicUI (and ClassicUI and HABmin). Most use BasicUI.
It is not related to sitemaps. It is related to the Location of a Thing. You can configure this parameter in PaperUI for each Thing and you can see in the control tab of PaperUI your related Items (the ones that are linked to the Thing with such Location).
If you have not assigned a Location to your Things, the associated Items will appear under the Other Tab in the Control section of PaperUI.
Important Note: The above story is true only for Items linked to Things (v2 bindings)… not Items linked to legacy (1.x) bindings. You won’t be able to see in the Control section any v1 bound Items.
See for example: Migration to KNX2 with multiple bridge - #7 by Dim